Celeb Heat Index: Here's the Hottest of the Hot From April

April showers were no match for the heat generated this month by our favorite stars. From Lindsay Lohan's breakup to Susan Boyle's breakout, media outlets focused on heartbreak and inspiration. USA TODAY check outs Celebrity Heat Index highlights from April.

• Hottest celebrity by association: Michelle Obama. Again, it's not about her husband's first 100 days. It's all about her fashion, and Bo. Runner-up: Robyn Gibson. She files for divorce from Mel, and everyone gets another chance to see what this low-profile Hollywood wife looks like.

• Readers want to know more about: Susan Boyle. A video of her version of "I Dreamed a Dream" from "Les Miserables" on "Britain's Got Talent" on YouTube has more than 48.8 million views. The overnight sensation has 88% of readers wanting more coverage of her.

• Hottest actress: Lindsay Lohan. Her starring role this month? An online video spoof of a dating commercial. Runner-up: Angelina Jolie. She might be shooting "Salt" in New York, but her family life still trumps career when it comes to tabloids.

• Hottest actor: Brad Pitt. This Hollywood dad goes shopping with family on Long Island, and photographs circulate online. Runner-up: Robert Pattinson."Twilight" fever continues when it comes to this on-screen vampire.

• Hottest musician: Britney Spears. As "Circus" tour continues, her possible relationships continue to be the main attraction. Runner-up: John Mayer. His weeks-ago split from Jennifer Aniston puts focus on whom he might be dating.

APRIL'S HOTTEST STARS AND HOW THEY SCORED

1. Lindsay Lohan: 559.The right blend of Heat Index ingredients: a breakup with DJ Samantha Ronson, a dating commercial spoof on FunnyorDie .com, a very gaunt look and bikini photos at the beach.